Adding `content_security_policy` to the "Mappy" sample.

chrome/common/extensions/docs/examples/extensions/mappy/popup.js

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+var maps_key = "ABQIAAAATfHumDbW3OmRByfquHd3SRTRERdeAiwZ9EeJWta3L_JZVS0bOBRQeZgr4K0xyVKzUdnnuFl8X9PX0w";
+
+function gclient_geocode(address) {
+  var url = 'https://maps.googleapis.com/maps/api/geocode/json?address=' +
+            encodeURIComponent(address) + '&sensor=false';
+  var request = new XMLHttpRequest();
+
+  request.open('GET', url, true);
+  console.log(url);
+  request.onreadystatechange = function (e) {
+    console.log(request, e);
+    if (request.readyState == 4) {
+      if (request.status == 200) {
+        var json = JSON.parse(request.responseText);
+        var latlng = json.results[0].geometry.location;
+        latlng = latlng.lat + ',' + latlng.lng;
+
+        var src = "https://maps.google.com/staticmap?center=" + latlng +
+                  "&markers=" + latlng + "&zoom=14" +
+                  "&size=512x512&sensor=false&key=" + maps_key;
+        var map = document.getElementById("map");
+
+        map.src = src;
+        map.addEventListener('click', function () {
+          window.close();
+        });
+      } else {
+        console.log('Unable to resolve address into lat/lng');
+      }
+    }
+  };
+  request.send(null);
+}
+
+function map() {
+  var address = chrome.extension.getBackgroundPage().selectedAddress;
+  if (address)
+    gclient_geocode(address);
+}
+
+window.onload = map;